| /* |
| * Keyboard driver for Sharp Corgi models (SL-C7xx) |
| * |
| * Copyright (c) 2004-2005 Richard Purdie |
| * |
| * Based on xtkbd.c/locomkbd.c |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/init.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/jiffies.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <asm/irq.h> |
| |
| #include <asm/arch/corgi.h> |
| #include <asm/arch/hardware.h> |
| #include <asm/arch/pxa-regs.h> |
| #include <asm/hardware/scoop.h> |
| |
| #define KB_ROWS 8 |
| #define KB_COLS 12 |
| #define KB_ROWMASK(r) (1 << (r)) |
| #define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 ) |
| /* zero code, 124 scancodes + 3 hinge combinations */ |
| #define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 ) |
| #define SCAN_INTERVAL (HZ/10) |
| |
| #define HINGE_SCAN_INTERVAL (HZ/4) |
| |
| #define CORGI_KEY_CALENDER KEY_F1 |
| #define CORGI_KEY_ADDRESS KEY_F2 |
| #define CORGI_KEY_FN KEY_F3 |
| #define CORGI_KEY_CANCEL KEY_F4 |
| #define CORGI_KEY_OFF KEY_SUSPEND |
| #define CORGI_KEY_EXOK KEY_F5 |
| #define CORGI_KEY_EXCANCEL KEY_F6 |
| #define CORGI_KEY_EXJOGDOWN KEY_F7 |
| #define CORGI_KEY_EXJOGUP KEY_F8 |
| #define CORGI_KEY_JAP1 KEY_LEFTCTRL |
| #define CORGI_KEY_JAP2 KEY_LEFTALT |
| #define CORGI_KEY_MAIL KEY_F10 |
| #define CORGI_KEY_OK KEY_F11 |
| #define CORGI_KEY_MENU KEY_F12 |
| #define CORGI_HINGE_0 KEY_KP0 |
| #define CORGI_HINGE_1 KEY_KP1 |
| #define CORGI_HINGE_2 KEY_KP2 |
| |
| static unsigned char corgikbd_keycode[NR_SCANCODES] = { |
| 0, /* 0 */ |
| 0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0, /* 1-16 */ |
| 0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 0, 0, 0, 0, 0, /* 17-32 */ |
| KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0, /* 33-48 */ |
| CORGI_KEY_CALENDER, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0, /* 49-64 */ |
| CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, /* 65-80 */ |
| CORGI_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0, /* 81-96 */ |
| KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0, /* 97-112 */ |
| CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */ |
| CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2 /* 125-127 */ |
| }; |
| |
| |
| struct corgikbd { |
| unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)]; |
| struct input_dev *input; |
| |
| spinlock_t lock; |
| struct timer_list timer; |
| struct timer_list htimer; |
| |
| unsigned int suspended; |
| unsigned long suspend_jiffies; |
| }; |
| |
| #define KB_DISCHARGE_DELAY 10 |
| #define KB_ACTIVATE_DELAY 10 |
| |
| /* Helper functions for reading the keyboard matrix |
| * Note: We should really be using pxa_gpio_mode to alter GPDR but it |
| * requires a function call per GPIO bit which is excessive |
| * when we need to access 12 bits at once multiple times. |
| * These functions must be called within local_irq_save()/local_irq_restore() |
| * or similar. |
| */ |
| static inline void corgikbd_discharge_all(void) |
| { |
| /* STROBE All HiZ */ |
| GPCR2 = CORGI_GPIO_ALL_STROBE_BIT; |
| GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT; |
| } |
| |
| static inline void corgikbd_activate_all(void) |
| { |
| /* STROBE ALL -> High */ |
| GPSR2 = CORGI_GPIO_ALL_STROBE_BIT; |
| GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT; |
| |
| udelay(KB_DISCHARGE_DELAY); |
| |
| /* Clear any interrupts we may have triggered when altering the GPIO lines */ |
| GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT; |
| GEDR2 = CORGI_GPIO_LOW_SENSE_BIT; |
| } |
| |
| static inline void corgikbd_activate_col(int col) |
| { |
| /* STROBE col -> High, not col -> HiZ */ |
| GPSR2 = CORGI_GPIO_STROBE_BIT(col); |
| GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col); |
| } |
| |
| static inline void corgikbd_reset_col(int col) |
| { |
| /* STROBE col -> Low */ |
| GPCR2 = CORGI_GPIO_STROBE_BIT(col); |
| /* STROBE col -> out, not col -> HiZ */ |
| GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col); |
| } |
| |
| #define GET_ROWS_STATUS(c) (((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) | ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT)) |
| |
| /* |
| * The corgi keyboard only generates interrupts when a key is pressed. |
| * When a key is pressed, we enable a timer which then scans the |
| * keyboard to detect when the key is released. |
| */ |
| |
| /* Scan the hardware keyboard and push any changes up through the input layer */ |
| static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs) |
| { |
| unsigned int row, col, rowd; |
| unsigned long flags; |
| unsigned int num_pressed; |
| |
| if (corgikbd_data->suspended) |
| return; |
| |
| spin_lock_irqsave(&corgikbd_data->lock, flags); |
| |
| if (regs) |
| input_regs(corgikbd_data->input, regs); |
| |
| num_pressed = 0; |
| for (col = 0; col < KB_COLS; col++) { |
| /* |
| * Discharge the output driver capacitatance |
| * in the keyboard matrix. (Yes it is significant..) |
| */ |
| |
| corgikbd_discharge_all(); |
| udelay(KB_DISCHARGE_DELAY); |
| |
| corgikbd_activate_col(col); |
| udelay(KB_ACTIVATE_DELAY); |
| |
| rowd = GET_ROWS_STATUS(col); |
| for (row = 0; row < KB_ROWS; row++) { |
| unsigned int scancode, pressed; |
| |
| scancode = SCANCODE(row, col); |
| pressed = rowd & KB_ROWMASK(row); |
| |
| input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed); |
| |
| if (pressed) |
| num_pressed++; |
| |
| if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF) |
| && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) { |
| input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1); |
| corgikbd_data->suspend_jiffies=jiffies; |
| } |
| } |
| corgikbd_reset_col(col); |
| } |
| |
| corgikbd_activate_all(); |
| |
| input_sync(corgikbd_data->input); |
| |
| /* if any keys are pressed, enable the timer */ |
| if (num_pressed) |
| mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL); |
| |
| spin_unlock_irqrestore(&corgikbd_data->lock, flags); |
| } |
| |
| /* |
| * corgi keyboard interrupt handler. |
| */ |
| static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| { |
| struct corgikbd *corgikbd_data = dev_id; |
| |
| if (!timer_pending(&corgikbd_data->timer)) { |
| /** wait chattering delay **/ |
| udelay(20); |
| corgikbd_scankeyboard(corgikbd_data, regs); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * corgi timer checking for released keys |
| */ |
| static void corgikbd_timer_callback(unsigned long data) |
| { |
| struct corgikbd *corgikbd_data = (struct corgikbd *) data; |
| corgikbd_scankeyboard(corgikbd_data, NULL); |
| } |
| |
| /* |
| * The hinge switches generate no interrupt so they need to be |
| * monitored by a timer. |
| * |
| * We debounce the switches and pass them to the input system. |
| * |
| * gprr == 0x00 - Keyboard with Landscape Screen |
| * 0x08 - No Keyboard with Portrait Screen |
| * 0x0c - Keyboard and Screen Closed |
| */ |
| |
| #define HINGE_STABLE_COUNT 2 |
| static int sharpsl_hinge_state; |
| static int hinge_count; |
| |
| static void corgikbd_hinge_timer(unsigned long data) |
| { |
| struct corgikbd *corgikbd_data = (struct corgikbd *) data; |
| unsigned long gprr; |
| unsigned long flags; |
| |
| gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB); |
| if (gprr != sharpsl_hinge_state) { |
| hinge_count = 0; |
| sharpsl_hinge_state = gprr; |
| } else if (hinge_count < HINGE_STABLE_COUNT) { |
| hinge_count++; |
| if (hinge_count >= HINGE_STABLE_COUNT) { |
| spin_lock_irqsave(&corgikbd_data->lock, flags); |
| |
| input_report_switch(corgikbd_data->input, SW_0, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0)); |
| input_report_switch(corgikbd_data->input, SW_1, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0)); |
| input_sync(corgikbd_data->input); |
| |
| spin_unlock_irqrestore(&corgikbd_data->lock, flags); |
| } |
| } |
| mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL); |
| } |
| |
| #ifdef CONFIG_PM |
| static int corgikbd_suspend(struct device *dev, pm_message_t state, uint32_t level) |
| { |
| if (level == SUSPEND_POWER_DOWN) { |
| struct corgikbd *corgikbd = dev_get_drvdata(dev); |
| corgikbd->suspended = 1; |
| } |
| return 0; |
| } |
| |
| static int corgikbd_resume(struct device *dev, uint32_t level) |
| { |
| if (level == RESUME_POWER_ON) { |
| struct corgikbd *corgikbd = dev_get_drvdata(dev); |
| |
| /* Upon resume, ignore the suspend key for a short while */ |
| corgikbd->suspend_jiffies=jiffies; |
| corgikbd->suspended = 0; |
| } |
| return 0; |
| } |
| #else |
| #define corgikbd_suspend NULL |
| #define corgikbd_resume NULL |
| #endif |
| |
| static int __init corgikbd_probe(struct device *dev) |
| { |
| struct corgikbd *corgikbd; |
| struct input_dev *input_dev; |
| int i; |
| |
| corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL); |
| input_dev = input_allocate_device(); |
| if (!corgikbd || !input_dev) { |
| kfree(corgikbd); |
| input_free_device(input_dev); |
| return -ENOMEM; |
| } |
| |
| dev_set_drvdata(dev, corgikbd); |
| |
| corgikbd->input = input_dev; |
| spin_lock_init(&corgikbd->lock); |
| |
| /* Init Keyboard rescan timer */ |
| init_timer(&corgikbd->timer); |
| corgikbd->timer.function = corgikbd_timer_callback; |
| corgikbd->timer.data = (unsigned long) corgikbd; |
| |
| /* Init Hinge Timer */ |
| init_timer(&corgikbd->htimer); |
| corgikbd->htimer.function = corgikbd_hinge_timer; |
| corgikbd->htimer.data = (unsigned long) corgikbd; |
| |
| corgikbd->suspend_jiffies=jiffies; |
| |
| memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode)); |
| |
| input_dev->name = "Corgi Keyboard"; |
| input_dev->phys = "corgikbd/input0"; |
| input_dev->id.bustype = BUS_HOST; |
| input_dev->id.vendor = 0x0001; |
| input_dev->id.product = 0x0001; |
| input_dev->id.version = 0x0100; |
| input_dev->cdev.dev = dev; |
| input_dev->private = corgikbd; |
| |
| input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW); |
| input_dev->keycode = corgikbd->keycode; |
| input_dev->keycodesize = sizeof(unsigned char); |
| input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode); |
| |
| for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++) |
| set_bit(corgikbd->keycode[i], input_dev->keybit); |
| clear_bit(0, input_dev->keybit); |
| set_bit(SW_0, input_dev->swbit); |
| set_bit(SW_1, input_dev->swbit); |
| |
| input_register_device(corgikbd->input); |
| |
| mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL); |
| |
| /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */ |
| for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) { |
| pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN); |
| if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt, |
| SA_INTERRUPT, "corgikbd", corgikbd)) |
| printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i); |
| else |
| set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING); |
| } |
| |
| /* Set Strobe lines as outputs - set high */ |
| for (i = 0; i < CORGI_KEY_STROBE_NUM; i++) |
| pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH); |
| |
| return 0; |
| } |
| |
| static int corgikbd_remove(struct device *dev) |
| { |
| int i; |
| struct corgikbd *corgikbd = dev_get_drvdata(dev); |
| |
| for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) |
| free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd); |
| |
| del_timer_sync(&corgikbd->htimer); |
| del_timer_sync(&corgikbd->timer); |
| |
| input_unregister_device(corgikbd->input); |
| |
| kfree(corgikbd); |
| |
| return 0; |
| } |
| |
| static struct device_driver corgikbd_driver = { |
| .name = "corgi-keyboard", |
| .bus = &platform_bus_type, |
| .probe = corgikbd_probe, |
| .remove = corgikbd_remove, |
| .suspend = corgikbd_suspend, |
| .resume = corgikbd_resume, |
| }; |
| |
| static int __devinit corgikbd_init(void) |
| { |
| return driver_register(&corgikbd_driver); |
| } |
| |
| static void __exit corgikbd_exit(void) |
| { |
| driver_unregister(&corgikbd_driver); |
| } |
| |
| module_init(corgikbd_init); |
| module_exit(corgikbd_exit); |
| |
| MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); |
| MODULE_DESCRIPTION("Corgi Keyboard Driver"); |
| MODULE_LICENSE("GPLv2"); |